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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value    
Less than one year $ 1,211  
One year through five years 6,018  
After five years through ten years 4,267  
Greater than ten years 3,571  
Fair Value 19,456 $ 7,384
Unrealized Losses    
Less than one year 14  
One year through five years 451  
After five years through ten years 637  
Greater than ten years 677  
Unrealized Losses 2,225 106
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 749  
Fair Value 749 629
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 109  
Unrealized Losses 109 10
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,037  
Fair Value 1,037 574
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 166  
Unrealized Losses 166 12
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,603  
Fair Value 2,603 2,061
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 171  
Unrealized Losses 171 $ 13
Supporting experience-rated products    
Fair Value    
Less than one year 35  
One year through five years 128  
After five years through ten years 154  
Greater than ten years 213  
Fair Value 590  
Unrealized Losses    
Less than one year 0  
One year through five years 6  
After five years through ten years 22  
Greater than ten years 39  
Unrealized Losses 73  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 11  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting experience-rated products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 32  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 3  
Supporting experience-rated products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 17  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 2  
Supporting remaining products    
Fair Value    
Less than one year 1,176  
One year through five years 5,890  
After five years through ten years 4,113  
Greater than ten years 3,358  
Fair Value 18,866  
Unrealized Losses    
Less than one year 14  
One year through five years 445  
After five years through ten years 615  
Greater than ten years 638  
Unrealized Losses 2,152  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 738  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 108  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,005  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 163  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,586  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 169